大地电磁全频段偏移成像结合反演技术

在提出的改进的有限差分法大地电磁场偏移成像技术基础上,进一步研究了全频段偏移成像技术,使成像信息得到了丰富完善,提高了分辨率,并推进到了适用于复杂地电模型和实际资料处理解释的阶段.以此为基础通过成像结果建立新的地电模型,结合有限元正演的特点并利用模拟退火全局寻优算法,实现了成像结合反演的计算过程,将形态与参数反演结合了起来,进一步提高了反演的精度.通过对江苏北部地质构造复杂地区实际资料的偏移成像结合反演处理和解释展示了该方法的有效性和实用性.

Magnetotelluric Sounding Whole Frequency Bands Migration Imaging Versus Inversion Technique

This paper puts forward a migration imaging technique using the whole frequency bands information of magnetotelluric sounding data on the basis of former studies about the migration imaging technique using an improved finite difference method,which enriches the imaging information and increases the accuracy of the finite difference equation and imaging resolution.Moreover,the studies reach the processing and interpretation stage for the complicated geo-electric models and field observed magnetotelluric sounding(MT) data.A new geo-electric model based on the imaging results then can be set up.Combining with the features of finite element forward modeling and the non-linear inversion algorithm of simulated annealing,the imaging versus inversion technique is achieved,which fulfills the inversion combination of interfaces and parameters and makes further improvement on the inversion accuracy.Based on the calculation results and interpretation of the field observed MT data in north Jiangsu area,the approach provided is testified as a more accurate and effective measure for MT data imaging and inversion,especially for the interpretation of complicated geological problems.